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Which pair of elements is MOST likely to chemically combine and form ionic bonds?. A). chlorine and chlorine. B). lithium and chlorine. C). carbon and hydrogen. D). sulfur and oxygen

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The pair of elements that will most likely combine chemically to form ionic bonds are B. Lithium and Chlorine.

Answer: B). lithium and chlorine

Explanation: An ionic bond is formed between a metal and a non-metal by transfer of electrons from metal to non metal.

Electronic configuration of lithium:

[tex][Li]:31s^22s^1[/tex]

Lithium atom will loose one electron to gain noble gas configuration and form lithium cation with +1 charge.

[tex][Li^+]=1s^22s^2[/tex]

Chlorine atom has oxidation number of -1.

Electronic configuration of chlorine;

[tex][Cl]=1s^22s^22p^63s^23p^5[/tex]

Chlorine atom will gain one electron to gain noble gas configuration and form chloride ion with -1 charge.

[tex][Cl^-]=1s^22s^22p^63s^23p^6[/tex]

[tex]Li^+[/tex] combine with [tex]Cl^-[/tex] to form lithium chloride [tex](LiCl)[/tex]

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